2010 ASTON MARTIN V8 VANTAGE engine

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-2 Workshop Manual May 2007
Major Components
Compressor
• Engine mounted, driven by the accessory drive belt
• Variable displacement type
• High-pressure relief valve, to avoid system over-pressure
• ECU controlled clutch energised via a relay
Receiver drier
• Vertically mounted on the right-hand side of the engine bay
• The high-side charge port is installed to the high side entry pipe to the receiver drier
Condenser
• Multi-pass fin-over-tube type, mounted in front of the engine cooling pack and directly to the radiator
Trinary switch
Located in the compressor discharge pipe
• Provides a signal, via the A/C module, to the PCM, to disengage the compressor clutch should the refrigerant
pressure be less than 2 bar or greater than 30 bar
• Provides a hard-wired signal to the PCM, to switch the cooling fans to HIGH speed at 22 bar rising pressure and
to LOW speed at 17,5 bar falling pressure
• Provides a hard-wired signal to the PCM, to switch the radiator cooling fans to LOW speed at 12 bar rising
pressure and to switch the fans OFF at 8 bar falling
pressure
Expansion Valve
The expansion valve is located on the outside of the A/C unit
and comprises of a diaphragm, connected by a capillary
tube to a temperature sensing bulb, which regulates the
valve according to temperature variations at the evaporator
outlet pipe. This component is not serviceable.
A/C Unit

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Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-6 Workshop Manual May 2007
Diagnostics
Electrical Connectors
A/C Module (C0792)



A/C Module (C0791)
PinSpecification
1 Air flow mode actuator (output)
2 Temperature actuator (output)
3Blank
4Blank
5Blank
6 A/C On (A/C pressure sensor)
7Blank
8 Recirculation actuator (output)
9Blank
10 Blank
11 Temperature level (RHD)
12 Blower speed regulator (Output)
13 Air flow mode actuator (output)
14 Temperature actuator (output)
15 Blank
16 Output
17 HAVAC ECU (input)
18 Blank
19 Blower relay (engine bay fusebox)
20 Recirculation actuator (output)
21 Blank
22 blank
23 Temperature level (LHD)
24 Blower speed regulator input)




Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
May 2007 Workshop Manual 12-3-11
A/C System Testing
Pressure Check
1. Connect the Recovery / Recycling / Recharging unit.
2. Start the engine. Allow to warm up then run at a constant 1,500 rpm.
3. Set the following A/C controls:
• Air Circulation to ‘Recirculate’
• Temperature to ‘Max’ Cold
• Air Flow to ‘Vent’
4. Close all the vehicle doors and windows.
5. Measure the ambient temperature and high / low pressure side reading of Recovery / Recycling /
Recharging unit gauges.
6. Verify that the intersection of the pressure reading of the Recovery / Recycling / Recharging unit gauges and the
ambient temperature is in the shaded zone.
If there is any fault, inspect the refrigerant system according
to the troubleshooting chart.
Performance Test
1. Check the refrigerant pressure.
2. Place a dry-bulb thermometer in the driver-side center ventilator outlet.
3. Start the engine. Allow to warm up then run at a constant 1,500 rpm.
4. Set the A/C unit fan speed to ‘Max Hi’.
5. Turn the A/C system on.
6. Set the following A/C controls: • Air Circulation to ‘Recirculate’
• Temperature to ‘Max’ Cold
• Air Flow to ‘Vent’ 7. Close all the doors and windows.
8. Wait until the A/C output temperature stabilizes.
9. After the blower air is stabilized, read the dry-bulb
thermometer.
10. Verify the ambient temperature.
11. Verify the temperature is in the shaded zone.
If there is any fault, inspect the refrigerant system according
to the troubleshooting chart.
Vacuum Check
1. Stop the vacuum pump, note the high and low pressure side readings of the Recovery / Recycling / Recharging
unit gauges and wait for 5 min.
2. Check the high and low pressure side readings of the Recovery / Recycling / Recharging unit gauges.
1 If the readings have changed, inspect for leaks and go to Evacuation (Refer to ’E vacuation’, page 12-3-10).
2 If the readings have not changed, go to Charging (Refer to ’Charging’, page 12-3-10).
It is recommended th
at a free standing air mover is placed
in front of the conden ser / cooling system.
AMBIENT TEMPERATURE
°C {°F}
10
{50} 15
{59} 20
{68} 25
{77} 30
{86} 35
{95} 40
{104}
LOW-PRESSURE SIDE
HIGH-PRESSURE SIDE
PRESSURE READING OF MANIHOLD GAUGE
MPa {kgf/cm
2, psi}
2.0
{20, 284}
1.5
{15, 213}
1.0
{10, 142}
0.2
{2.0, 28}0.1
{1.0, 14}
0.15
{1.5, 22}
0.05
{0.5, 7.3} 0.5
{5.1, 73}
Stabilized condition.
The A/C compressor repeatedly turns on and off at regular intervals.
AMBIENT TEMPERATURE
°C (°F)
CENTER VENTILATILATOR TEMPERATURE
°C (°F)
12 {54}
10 {50}
8 {46}
6 {43}4 {39} 2 {36}
10
{50} 15
{59} 20
{68} 25
{77} 30
{86} 35
{95} 40
{104}

Air Conditioning (A/C) System (12.03)
Climate Control (12.00)
12-3-12 Workshop Manual May 2007
Leaks
Faults associated with low refrigerant charge weight and low pressure may be caused by leakage. Leaks traced to
mechanical connections may be caused by torque relaxation or joint face contamination. Evidence of oil around such
areas is an indicator of leakage.
Leak Detection
Fluorescent Tracer Dye - A fluorescent tracer dye is incorporated into th e refrigeration system and can be checked for
non-apparent leaks by scanning with a high intensity ultraviolet lamp. The location of leaks can be pinpointed by the bright
yellow glow of the tracer dye.
Automatic Refrigerant Leak Detector - (various manufacturers) Hand-held, portable, battery operated leak detector.
Place in and around A/C system to detect refrigerant leaks.
System Pressure Fault Classification
This table should be used in conjunction with the graphical representations of 'High side' pressure / ambient temperature
and 'Low side' pressure / evaporator temperature. Caution
Observe ALL safety precautions associ ated with ultraviolet equipment.
If erratic or unusual gauge movements occur, check the equipment against known Recovery / Recycling / Recharging unit
gauges.
Low side
gauge readingHigh side
gauge reading
Fault
Cause
Normal Normal Discharge air initially c ool then warms up Moisture in system
Normal to low Normal As above As above
Low Low Discharge air slightly cool Refrigerant charge low
Low Low Discharge air warm Refrigerant charge very low
Low Low Discharge air slightly cool or frost build up at expansion valve Expansion valve stuck closed
Low Low Discharge air slightly cool, sweating or frost after point of restriction Restriction in High side of system
High Low Compressor noisy Defective compressor reed valve
High High Discharge air warm and high side pipes hot Refrigerant charge high or inefficient
condenser cooling due to air flow blockage or
engine cooling fans not working
High High Discharge air warm
Sweating or frost at evaporator Expansion valve stuck open

Instrument Cluster (13.01)
Information, Gauge and Warning (13.00)13-1-2 Workshop Manual May 2007
Information, Gauge and Warning (13.00)
Instrument Cluster (13.01)
Description
The Driver Information module contains the necessary electronic control units and memories to control, process and
present all necessary vehicle information to the driver.
1. Information on vehicle performance is presented in visible form using the instruments and gauges. These
devices present such information as Vehicle Speed,
Engine Speed, Fuel Level and Coolant Temperature.
2. Information on vehicle status is presented by an array of warning lights.
• Red - indicate immediate danger warnings
• Amber - indicate conditions which are serious but not immediately dangerous
• Green and Blue - indicate normal actuation of items such as turn signals or fog lamps
The message centres and the shift position Sensor
display are used to present information on the distance
recorders (trip meters), current gear mode and current
gear engaged.
3. The right message centre is used to display any warning/ information message text. These text messages may be
reinforced in some cases by illumination of the
appropriate warning lamps.
The following table defines all information and warning
lamps and their significance:

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Instrument Cluster (13.01)
Information, Gauge and Warning (13.00)
May 2007 Workshop Manual 13-1-3
Information and Warning Lamps
Name / FunctionDescriptionSymbolInput SignalPower
On Check
General Warning
– Amber/Red Controlled internally by the DIM. It is used in conjunction with
several text messages to indicate information to the driver. Internal
SRS (Airbag) Controlled externally by the SRS module and indicates a fault in the SRS module. CAN Yes (5 Seconds)
High Engine
Coolant Temp. This tell tale is controlled internally by the DIM. Activated
when the engine coolant temperature signal from the CAN bus
reaches a pre defined value. (The
actual symbol is not lit, only
the red LED.) CAN
DSC Controlled externally by the ABS/DSC module. Indicates when the system is in operation or when it is turned off. The tell tale
is triggered by a CAN signal. CAN Yes (5 Seconds)
ABS Controlled externally by th e ABS/DSC module. Indicates a
fault in the ABS system. The tell tale is triggered by a CAN
signal. CAN Yes (5 Seconds)
Rear Fog Lights Controlled externally by the SRS module. Indicates that the
rear fog lights are turned on. The tell tale is triggered by a CAN
signal. CAN Yes (5 Seconds)
Seat Belts Controlled externally by the CEM. Indicates that the seat belts are not fastened properly. The tell tale is triggered by a CAN
signal. CAN Yes (5 Seconds)
Brake (General) Controlled externally by either the CEM or the ABS / DSC module. It indicates low brake fluid level, brake fault and park
brake. The tell tale is triggered by two low side inputs or a CAN
signal. Low side x 2
and
CAN Ye s ( 5 S e c o n d s )
Side Lights Controlled externally by th e CEM. Indicates that the side lights
are on. High side
Oil Pressure Controlled exte rnally by the PCM. Indicates low oil pressure.
The tell tale is triggered by a CAN signal. CAN Yes (5 Seconds)
Battery Charge Controlled externally by th e CEM. Indicates that the alternator
is no longer charging the battery properly. The tell tale is
triggered by a CAN signal. CAN Yes (5 Seconds)
Fuel Level Low Controlled internally by the DIM. Activated when the fuel level drops below a pre defined value. The fuel information is
provided from the CAN bus. The symbol is not lit, only the
amber LED. CAN
Turn Left/Right Controlled externally by th e CEM. The tell tale is triggered by a
CAN signal. CAN
High Beam Controlled externally by the CEM. Indicates that the high beam is switched on. The tell tale is triggered by a CAN signal. CAN
Check Engine Controlled externally by the PCM. Indicates a fault in the engine management system. The te ll tale is not connected to
the microprocessor. Low side
Tyre Pressure Controlled by the DIM. In dicates a low or rapid change in the
tyre pressure or a tyre pressure monitoring system fault. Low side Yes (5 Seconds)
Not Used
PATS Controlled externally by the PCM. Indicates key acceptance status. Low side

Battery System (14.01)
Power Supply (14.00)14-1-2 Workshop Manual May 2007
Power Supply (14.00)
Battery System (14.01)
Description
The 12 volt negative earth (‘-’ ve) battery is located under the RH side rear seat and is grounded to the vehicle body.
The battery positive (‘+’ ve) terminal is connected to a battery connect switch. The connect switch may be accessed by
raising the rear seat cushion.
Battery Connect Switch
When the battery connect switch is in an ‘open’ state it
isolates electrical power from all systems except the ‘keep
alive memory’ functions in the PCMs, TCU, radio,
navigation system and door modules.
This function isolates electri cal power from vehicle circuits
under all normal service conditions with the following
exceptions:
• Before any welding or other work which may induce high voltages into the electronic control modules
• Before disconnecting any of the control modules with ‘keep alive memory ’
• Before any major service task (e.g . engine removal)
• Before installing any accessory which involves modification of vehicle wiring
In the above four exceptions the battery earth (‘-’ ve) lead
should be disconnected.
When the battery earth (‘-’ ve) terminal is disconnected,
data held in keep alive memories will be lost. After connecting the battery, the radio preset stations and the
door window controllers will require to be reset (adaptive
learning data in the PCM module will require to be re-
learned by driving the vehicle for some miles in a range of
driving conditions),
driveability may be slightly
compromised until the vehicle systems have completed
their adaptive learning routines again.
Battery Disconnection and Alarm
Activation
The vehicle is installed with an alarm which will be activated
if the battery is disconnected. This alarm is driven by a back
up battery within the alarm sounder unit.
To prevent the alarm from so unding when the battery is
disconnected (for workshop procedures), disconnect the
battery within 10 seconds of switching off the ignition.
Always carry out the following procedures upon connection
of the battery.
• Reset the clock
• Reset the radio preset programmes.
• Reset the window maximum up and maximum down settings.
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Battery System (14.01)
Power Supply (14.00)
May 2007 Workshop Manual 14-1-3
Charging Circuit
Electrical power generated at the alternator flows via two ‘T Pi ece’ connectors to the engine bay ‘Dirty Feed’ stud. It then
flows via the Battery Disconnect Switch (BDS) to the battery positive terminal. Both the alternator and the battery are
earthed via the vehicle body to complete the charging circuit.
The starter motor and the ‘jump start terminal’ ar e also fed directly from the charging circuit.
Go to page 18-X-XX for complete power dist ribution circuit diagram (Circuit Sheet 25).
+12 Volt Distribution
The +12 volt supply comes from the battery to the battery disc onnect switch (BDS). Assuming that this switch is not
activated, 12 volt power is then available from C0046-8 on the BDS to all of the clean feed battery studs.
The following clean feeds are then live:
• Boot fuse box clean feed
• Under bonnet fuse box clean feed
• CEM busbars 1, 2, 3 and 4 clean feeds
12V power to all systems and components is then controlled by the CEM and the under bonnet / boot fuse boxes.